minor fixes and gofmt
Correct custom cAdvisor instructions

Point the user that wants to build a custom cAdvisor container to the actual location of the build script/Dockerfile.
Merge pull request #272 from highlyunavailable/master

Correct custom cAdvisor instructions
Merge pull request #270 from ashahab-altiscale/raw-network-handler

Raw cgroup handler network support using external hints file
Mounted partitions space usage metrics per container

This computes the space usage for mounted partitions. It takes in a list of mounted partitions from containerHints
and computes the device's disk usage(so each mount must be a separate partition). This is useful for users who
mount partitions on containers and store most of the container's persistent data on those partitions.